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K: Fachverband Kurzzeitphysik

K 6: Laserstrahlwechselwirkung, Lasermaterialbearbeitung I

K 6.1: Vortrag

Donnerstag, 15. März 2012, 11:30–11:45, V57.04

Dynamics of electrons in liquid water excited with an ultrashort VUV laser pulse — •Klaus Huthmacher and Bärbel Rethfeld — TU Kaiserslautern, Deutschland

In this work we present the theoretical study of the interaction of an ultrashort VUV laser pulse with liquid water. For the laser pulse we assume a gaussian shape with a duration of 25 fs and an average photon energy of 50 eV. These photons ionize water molecules generating free electrons, which further create secondary electrons due to ionization or interact via elastic collisions with other water molecules.
We use a kinetic Monte Carlo method to track each electron and its collisions event by event. In the first step we calculate the penetration depth of the photons. Next we evaluate the cross sections for the free electrons refering to ionization, elastic collisions and Auger recombination. Furthermore we compute mean free paths and finally we get the energy loss due to elastic collisions or the energy transfer to secondary electrons due to ionization.
As results we present time- and energetically resolved electron distributions.